Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 0Dh
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  Interrupt:   10h     Function:   0Dh
 
  Title:       Read Graphics Pixel
 
  See also:    Write Graphics Pixel
 
  Description:                           [CGA] [PCjr] [EGA] [MCGA] [VGA]
 
     Obtains the current value of the pixel on the display at the
     specified graphics coordinates.
 
     Input                                   Output
 
     AH = 0Dh                                AL = Pixel value
     BH = Page
     CX = Column (graphics x coordinate)
     DX = Row (graphics y coordinate)
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